<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>CSS盒子</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <style>
        h3 {
            display: inline;
        }

        body {
            color: #006699;
        }

        p {
            border: thin solid #006699;
            color: #00cc66;
        }
    </style>

</head>
<body>
    <h3>注意: </h3>
    <p>这是呈现的是注意要提供的内容, "注意: "会插入到这一段前面.</p>
    
</body>
</html>